Android ListView下拉与上拉刷新加载更多数据 二
2015-12-09 00:47
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效果图:
java代码中:
activity_main.xml中
这里使用到了一个自定义的Swiperefreshlayout
java代码中:
public class MainActivity extends Activity implements OnRefreshListener, OnLoadListener { private RefreshLayout swipeLayout; private ListView listView; private MyAdapter adapter; private ArrayList<HashMap<String, String>> list; private View header; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); setData(); setListener(); } private void initView() { header = getLayoutInflater().inflate(R.layout.header, null); swipeLayout = (RefreshLayout) findViewById(R.id.swipe_container); swipeLayout.setOnRefreshListener(this); swipeLayout.setColorScheme(android.R.color.holo_blue_bright, android.R.color.holo_green_light, android.R.color.holo_orange_light, android.R.color.holo_red_light); } private void setData() { list = new ArrayList<HashMap<String, String>>(); for (int i = 0; i < 20; i++) { list.add(new HashMap<String, String>()); } listView = (ListView) findViewById(R.id.list); //listView.addHeaderView(header); adapter = new MyAdapter(this, list); listView.setAdapter(adapter); } private void setListener() { swipeLayout.setOnRefreshListener(this); swipeLayout.setOnLoadListener(this); } /** * 下拉加载更新数据 */ @Override public void onRefresh() { swipeLayout.postDelayed(new Runnable() { @Override public void run() { // 更新数据 // 更新完后调用该方法结束刷新 swipeLayout.setRefreshing(false); } }, 3000); } /** * 上拉加载更新数据 */ @Override public void onLoad() { swipeLayout.postDelayed(new Runnable() { @Override public void run() { // 更新数据 // 更新完后调用该方法结束刷新 swipeLayout.setLoading(false); } }, 5000); } }
activity_main.xml中
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <com.example.swiperefreshlayoutdemo.RefreshLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/swipe_container" android:layout_width="match_parent" android:layout_height="match_parent" > <ListView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" > </ListView> </com.example.swiperefreshlayoutdemo.RefreshLayout> </RelativeLayout>
这里使用到了一个自定义的Swiperefreshlayout
import android.content.Context; import android.support.v4.widget.SwipeRefreshLayout; import android.util.AttributeSet; import android.util.Log; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.ListView; /** * 继承自SwipeRefreshLayout,从而实现滑动到底部时上拉加载更多的功能. * * @author mrsimple */ public class RefreshLayout extends SwipeRefreshLayout implements OnScrollListener { /** * 滑动到最下面时的上拉操作 */ private int mTouchSlop; /** * listview实例 */ private ListView mListView; /** * 上拉监听器, 到了最底部的上拉加载操作 */ private OnLoadListener mOnLoadListener; /** * ListView的加载中footer */ private View mListViewFooter; /** * 按下时的y坐标 */ private int mYDown; /** * 抬起时的y坐标, 与mYDown一起用于滑动到底部时判断是上拉还是下拉 */ private int mLastY; /** * 是否在加载中 ( 上拉加载更多 ) */ private boolean isLoading = false; /** * @param context */ public RefreshLayout(Context context) { this(context, null); } public RefreshLayout(Context context, AttributeSet attrs) { super(context, attrs); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); mListViewFooter = LayoutInflater.from(context).inflate( R.layout.listview_footer, null, false); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); // 初始化ListView对象 if (mListView == null) { getListView(); } } /** * 获取ListView对象 */ private void getListView() { int childs = getChildCount(); if (childs > 0) { View childView = getChildAt(0); if (childView instanceof ListView) { mListView = (ListView) childView; // 设置滚动监听器给ListView, 使得滚动的情况下也可以自动加载 mListView.setOnScrollListener(this); Log.d(VIEW_LOG_TAG, "### 找到listview"); } } } /* * (non-Javadoc) * * @see android.view.ViewGroup#dispatchTouchEvent(android.view.MotionEvent) */ @Override public boolean dispatchTouchEvent(MotionEvent event) { final int action = event.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: // 按下 mYDown = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: // 移动 mLastY = (int) event.getRawY(); break; case MotionEvent.ACTION_UP: // 抬起 if (canLoad()) { loadData(); } break; default: break; } return super.dispatchTouchEvent(event); } /** * 是否可以加载更多, 条件是到了最底部, listview不在加载中, 且为上拉操作. * * @return */ private boolean canLoad() { return isBottom() && !isLoading && isPullUp(); } /** * 判断是否到了最底部 */ private boolean isBottom() { if (mListView != null && mListView.getAdapter() != null) { return mListView.getLastVisiblePosition() == (mListView .getAdapter().getCount() - 1); } return false; } /** * 是否是上拉操作 * * @return */ private boolean isPullUp() { return (mYDown - mLastY) >= mTouchSlop; } /** * 如果到了最底部,而且是上拉操作.那么执行onLoad方法 */ private void loadData() { if (mOnLoadListener != null) { // 设置状态 setLoading(true); // mOnLoadListener.onLoad(); } } /** * @param loading */ public void setLoading(boolean loading) { isLoading = loading; if (isLoading) { mListView.addFooterView(mListViewFooter); } else { mListView.removeFooterView(mListViewFooter); mYDown = 0; mLastY = 0; } } /** * @param loadListener */ public void setOnLoadListener(OnLoadListener loadListener) { mOnLoadListener = loadListener; } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // 滚动时到了最底部也可以加载更多 if (canLoad()) { loadData(); } } /** * 加载更多的监听器 * * @author mrsimple */ public static interface OnLoadListener { public void onLoad(); } }
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